Arm64 Support for RedoxOS

I think Redox has the chance to avoid some of the mistakes Linux is stuck with; poor legacy TTY system, locks on files are cleared when the FD is closed, inconsistent system call behavior. It is technically a Unix-compatible OS but creating so many things from scratch allows a lot of flexibility to avoid old problems.

> The Redox OS kernel now supports aarch64 in the default branch. Work is ongoing to produce a fully booting image. Porting riscv64 is in progress as well, with many important dependencies already ported.

- https://twitter.com/redox_os/status/1389585044222578692